Snapshot Backup Error

An unknown response returned from Snapshot backup attempt. Aborting. Double check Snapshot settings.

I've been trying to export a backup of the entire multisite but am having an issue where snapshot seems to be constantly erroring out once it hits plugins. I had managed to complete a snapshot but it was missing the manifest.txt file when I exported it and seemed like it was much too small to be a full restore.

I have granted support access via WPMU DEV Dashboard.